How should I get and set a value of UserDefaults? - swiftui

Question

I'm currently developing an application using SwiftUI.
I want to use a UserDefaults value in this app.
So I made a code below.
But in this case, when I reboot the app(the 4'th process in the process below), I can't get value from UserDefaults...
Build and Run this project.
Pless the home button and the app goes to the background.
Double-tap the home button and remove the app screen.
press the app icon and reboot the app. Then I want to get value from UserDefaults.
to resolve this problem how should I set and get a value in UserDefaults?
Here is the code:
import SwiftUI
struct ContentView: View {
#State var text = "initialText"
var body: some View {
VStack {
Text(text)
TextField( "", text: $text)
}.onAppear(){
if let text = UserDefaults.standard.object(forKey: "text" ){
self.text = text as! String
}
}
.onDisappear(){
UserDefaults.standard.set(self.text, forKey: "text")
}
}
}
struct ContentView_Previews: PreviewProvider {
static var previews: some View {
ContentView()
}
}
ADD
When I add this class following the first answer, that code has a couple of errors like this, is it usual?
Xcode: Version 11.7
Swift: Swift 5

Answer 1

Set in a class like this your values: Bool, String(see example), Int, etc...
#if os(iOS)
import UIKit
#else
import AppKit
#endif
import Combine
#propertyWrapper struct UserDefault<T> {
let key: String
let defaultValue: T
init(_ key: String, defaultValue: T) {
self.key = key
self.defaultValue = defaultValue
}
var wrappedValue: T {
get {
return UserDefaults.standard.object(forKey: key) as? T ?? defaultValue
}
set {
UserDefaults.standard.set(newValue, forKey: key)
}
}
}
final class UserSettings: ObservableObject {
let objectWillChange = PassthroughSubject<Void, Never>()
#UserDefault("myText", defaultValue: "initialText")
var myText: String {
willSet { objectWillChange.send() }
}
}
this to read:
let settings = UserSettings()
let count = settings.countSentence // default countsentence 1
this to update:
let settings = UserSettings()
settings.countSentence = 3 // default countsentence 3
Based on your code:
struct ContentView: View {
let UserDef = UserSettings()
#State var text = ""
var body: some View {
VStack {
Text(UserDef.myText)
TextField("placeholder", text: $text, onCommit: { self.UserDef.myText = self.text})
}.onAppear() {
self.text = self.UserDef.myText
}
}
}